CN117464513A

CN117464513A - Electric drive device

Info

Publication number: CN117464513A
Application number: CN202310924919.9A
Authority: CN
Inventors: 稻毛康介; 花井祯; 佐藤英次
Original assignee: Hosiden Corp
Current assignee: Hosiden Corp
Priority date: 2022-07-27
Filing date: 2023-07-26
Publication date: 2024-01-30
Also published as: US20240033894A1; JP2024017242A; DE102023117851A1

Abstract

An electric drive device, comprising: a device body having an actuator; and a handle which is detachable from the device body. The handle has: a connection part detachably connected to the apparatus main body; a pressure-receiving member that is displaced by a gripping force when a user grips the handle; a magnet control mechanism for operating the permanent magnet in association with the displacement of the pressure-receiving member; and a frame section that supports the pressure-receiving member so as to be displaceable, and accommodates the magnet control mechanism. The device body includes a magnetic sensor that detects the magnetic force of the permanent magnet that is acted upon by the connection portion when the pressure-receiving member is displaced in a state in which the handle is attached to the device body.

Description

Electric drive device

Technical Field

The present disclosure relates to an electric drive device including a device body having an operation portion driven by an actuator, and a handle detachably attached to the device body.

Background

Conventionally, as an electric drive device driven by an actuator, a disc grinder, an electric drill, or the like has been used. Among such electric drive apparatuses, there are the following: the handle is installed when in use and removed when not in use (see, for example, U.S. patent application publication No. 2018/0272494 and U.S. patent application publication No. 2014/023673).

The electric drive device described in U.S. patent application publication No. 2018/0272494 is configured as follows: the external screw thread of the bolt is protruded from the tip of the handle, and the external screw thread is screwed to the device body, whereby the handle can be attached and detached. In the electric drive device described in U.S. patent application publication No. 2018/0272494, a magnet is disposed inside a male screw, and a hall element is disposed in a device body, whereby it is possible to detect that a handle has been attached to the device body.

The electric drive device described in U.S. patent application publication No. 2014/023173 accommodates a pressure sensor or the like in the handle, and transmits an electric signal from the pressure sensor to a detection circuit provided in the device body. This allows the user to detect that the handle has been gripped.

Disclosure of Invention

The electrically driven device described in U.S. patent application publication No. 2018/0272494 is capable of detecting that the handle has been mounted to the device body, but is incapable of detecting that the user has gripped the handle. Further, when the handle is detached from the device body, a magnet disposed inside the male screw may attract a magnetic substance such as iron powder to the surface of the male screw, and a problem such as a foreign matter getting stuck may occur due to the magnetic substance when the handle is attached to the device body.

The electric drive device described in U.S. patent application publication No. 2014/023673 is capable of detecting the grip of a user on a handle, but requires electrical contacts for power supply and communication between the handle and the device body. Therefore, the electrical contact may be defective in conduction due to dirt, rust, or the like, and the grip of the handle may not be detected. Further, the external thread of the handle requires electric wiring until reaching the electric contact between the handle and the device main body, and the reduction in bolt strength and/or the increase in size are liable to occur.

Accordingly, there is a need for an electric drive device capable of detecting the gripping state of an accessory component without affecting the connection portion connecting the accessory component to the device body.

The electric drive device according to the present disclosure is characterized in that:

the electric drive device is provided with: a device body; and an accessory component which is detachable from the device main body, wherein the accessory component comprises: a connection part connected to the device main body; a pressure-receiving member that is displaced inward by a gripping force when a user grips the attachment member; a permanent magnet; a magnet control mechanism for moving or changing the orientation of the permanent magnet in association with the displacement of the pressure-receiving member; and a frame portion that supports the pressure-receiving member so as to be displaceable and accommodates the magnet control mechanism, wherein the device body includes a magnetic sensor that detects a magnetic force of the permanent magnet acting through at least a part of the connection portion when the pressure-receiving member is displaced in a state where the accessory member is attached to the device body.

In this configuration, when the user grips the accessory and moves or changes the orientation of the permanent magnet by the magnet control mechanism in response to the grip, the magnetic force of the permanent magnet acting through at least a part of the connection portion can be monitored by the magnetic sensor. The magnet control mechanism is accommodated in the frame portion and mechanically operates in response to the grasping, and thus it is not necessary to provide electrical contacts, electrical wiring, and the like in the connection portion. Further, since the permanent magnet and the magnet control mechanism are accommodated in the frame portion, when the accessory is not mounted, a magnetic body such as iron powder is less likely to be attracted to the connection portion or the like, and mounting failure due to a foreign matter caught by the magnetic body can be reduced. Therefore, the following electric drive device is constituted: the electric contact is not required, the device defect caused by the clamping foreign matter is eliminated, the connecting part for connecting the accessory part and the device main body is not influenced, and the gripping state of the accessory part can be detected.

As another feature, the apparatus main body has a connection holding portion to which a coupling member is coupled to couple the accessory member to the apparatus main body.

Accordingly, the connection portion can be configured such that the accessory component is coupled to the device main body by the coupling component.

Other characteristics are as follows:

the connection portion has a coupling member made of a magnetic material, and the device body has a connection holding portion capable of coupling the accessory member to the device body by coupling a tip end of the coupling member, and the permanent magnet causes the magnetic force to act on the magnetic sensor via the coupling member.

As described above, since the coupling member is provided with the magnetic body, the magnetic force of the permanent magnet can be applied to the magnetic sensor via the coupling member, and the detection accuracy of the magnetic force can be improved without shortening the distance between the permanent magnet and the magnetic sensor. Further, since the coupling member made of a magnetic material is used, a yoke is not additionally provided for applying a magnetic force to the magnetic sensor, and an increase in the number of components can be suppressed.

Other characteristics are as follows:

the magnet control means controls the position of the magnetic pole of the permanent magnet so that the magnetic force acting on the magnetic sensor from the permanent magnet via the coupling member is maintained in a state that the first condition is not satisfied when the pressure-receiving member is not displaced in the non-gripping position, and the magnetic force acting on the magnetic sensor from the permanent magnet via the coupling member is maintained in a state that the second condition is satisfied when the pressure-receiving member is displaced by the gripping force.

As in the present configuration, when the accessory is not attached, the user does not grasp the accessory, and therefore the magnetic force acting on the magnetic sensor from the permanent magnet is maintained in a state that does not satisfy the first condition. When the accessory is attached and the user does not grasp the accessory properly and the second condition is not satisfied, the electric current cannot be started to be supplied to the actuator such as the electric motor of the electric drive apparatus. In contrast, when the user appropriately grips the accessory, the state is determined to satisfy the second condition, and thereby the state can be shifted to a state in which the supply of current to the actuator such as the electric motor of the electric drive device can be started.

Other characteristics are as follows:

when the first condition is not satisfied, the pressure-receiving member is displaced so as to be in a state of satisfying the first condition, and the supply of the current in the electric drive device is enabled, and when the first condition is satisfied and the second condition is satisfied, the supply of the current in the electric drive device is enabled, and even when the current supply is in a state of satisfying the first condition and the second condition is not satisfied, the supply of the current can be continued.

As in the present configuration, when the user grips the accessory member in a state where the first condition is satisfied, the user transitions to a state where the second condition is satisfied, and thus, for example, current is supplied to an actuator such as an electric motor of the electric drive device. In the case where the current is supplied in this way, even if the state is changed to a state in which the first condition is satisfied and the second condition is not satisfied as in the case where the grip force of the user on the accessory is reduced, the current can be continuously supplied.

Other characteristics are as follows:

the magnet control means controls the position or orientation of the magnetic pole of the permanent magnet to a state in which the magnetic force acting on the magnetic sensor from the permanent magnet via the coupling member satisfies the first condition and does not satisfy the third condition when the pressure-receiving member is displaced by the grasping force, and can save current when the first condition is satisfied and the third condition is not satisfied.

In this configuration, when the grip force of the user on the accessory is reduced after the second condition is reached, the third condition can be shifted, and when the third condition is shifted, for example, by saving the supply of the current to the actuator such as the electric motor of the electric drive device, the current can be continuously supplied so as to determine the upper limit of the current supplied to the actuator.

Other characteristics are as follows:

the magnet control mechanism is composed of the following components: a rotating member rotatably supporting the permanent magnet; and a gear unit that converts a displacement operation when the pressure-receiving member is displaced by the gripping force into a rotation operation and transmits the rotation operation to the rotating member, wherein the magnetic pole of the permanent magnet approaches the coupling member to rotate the rotating member and the magnetic force acting on the magnetic sensor acts when the pressure-receiving member is displaced.

In this configuration, when the user grips the accessory member, the magnet control mechanism rotates the permanent magnet by the grip force to move or change the direction of the magnetic pole of the magnet, thereby bringing the magnetic pole into proximity with the coupling member, and the magnetic force can be detected by the magnetic sensor.

Other characteristics are as follows:

the electric drive device is configured as follows: by disposing the pressure-receiving members at two positions along the longitudinal direction of the frame portion, at least 1 of the pressure-receiving members are displaced in a direction in which the pair of pressure-receiving members approach each other when the user grips the accessory member, and the gear unit includes: a pinion gear engaged with rack and pinion portions formed in a pair of operation frames integrally moved with the respective pressure-receiving members of the pair of pressure-receiving members; and a plurality of linked gears for transmitting the rotation of the pinion gear to the rotating member.

In this configuration, the pair of pressure-receiving members and the pair of operation frames integrated with the pair of pressure-receiving members are operated, the pinion gear engaged with the rack gear portion of each of the pair of operation frames is rotated, and the rotation operation of the pinion gear is transmitted to the rotating member via the plurality of interlocking gears, whereby the permanent magnet can be reliably rotated, and the conditions of the magnetic force can be controlled by increasing or decreasing the magnetic force acting on the magnetic sensor or switching the magnetic poles.

Other characteristics are as follows:

the pinion gear is composed of a first pinion gear and a second pinion gear, the first pinion gear is provided so as to mesh with a first rack gear portion of a first operation frame formed on one operation frame side of a pair of operation frames which are integrally moved with the respective pressure-receiving members, the second pinion gear is provided so as to mesh with a second rack gear portion formed on the other operation frame side of the pair of operation frames, and a coupling rack gear for coupling the first pinion gear and the second pinion gear is provided.

According to this configuration, the first pinion gear and the second pinion gear rotate in association with the displacement of the pressure-receiving member, and the first pinion gear and the second pinion gear rotate in association with each other by the coupling of the rack gear, whereby even if the pressure-receiving member is gripped in a biased manner, transmission is achieved in such a manner that the displacement of the pressure-receiving member, which is parallel-moved in a state in which the parallel state is maintained, is transmitted to the gear unit.

Other characteristics are as follows:

and a biasing member provided in the frame portion, the biasing member being configured to act in a direction away from the frame axis extending in the longitudinal direction of the frame portion when the pressure-receiving member is displaced inward.

As in the present configuration, by using the biasing member, when the user releases the accessory member, the pressure receiving member can be quickly returned to the non-gripping position by the biasing force of the biasing member.

Other characteristics are as follows:

as the biasing member, at least 1 of a rubber elastic body, a coil spring, and a leaf spring is used.

In this configuration, at least 1 of a rubber elastic body, a coil spring, a leaf spring, or other members that can exert the same force can be used in order to obtain the required force.

Drawings

Fig. 1 is a perspective view of a disc grinder.

Fig. 2 is an exploded perspective view of the handle of the disc grinder.

Fig. 3 is a cross-sectional view of the handle as seen from a direction orthogonal to the actuation direction of the actuation lever.

Fig. 4 is a sectional view of the handle as seen from a direction along the actuation direction of the actuation lever.

Fig. 5 is a sectional view showing the form of the permanent magnet in a state where the operation lever is not gripped and in a gripped state.

Fig. 6 is a cross-sectional view of the handle as seen from a direction orthogonal to the longitudinal direction.

Detailed Description

Embodiments of the present disclosure are described below based on the drawings.

In this embodiment, a disc grinder a is described as an example of an electric drive device. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the spirit and scope of the present invention.

[ basic constitution ]

As shown in fig. 1, the disc grinder a is configured to include the following components: a device body 1 incorporating an electric motor M; a disk 2 provided at an end of the device body 1; a disc cover 3 covering a part of the outer periphery of the disc 2; a power switch 4 for driving (turning on) and stopping (turning off) the electric motor M; and a handle 5 as an accessory part (one example of an accessory part) mounted to the outer surface of the apparatus body 1.

The disk grinder a is supplied with electric power for driving the electric motor M via the power supply line 6. The apparatus body 1 is formed in a cylindrical shape as a whole. The handle 5 has a smaller diameter than the device body 1, and is provided in the disc grinder a along a frame axis X perpendicular to the longitudinal direction of the device body 1.

In the disk grinder a, the disk 2 is made of a grindstone, and the disk 2 is rotated at a high speed, so that the object to be processed can be ground. The disc grinder a is operated in such a manner that the user grips the apparatus body 1 with the right hand and grasps (holds) the handle 5 with the left hand.

The handle 5 is detachable (detachable) from the apparatus body 1. The disc grinder a includes the following control circuit 10: in a state where the handle 5 is properly attached to the apparatus main body 1, the user grips the handle 5 with a force (gripping force) exceeding a set value, thereby allowing the driving of the electric motor M.

Not shown in the drawings, but the disc grinder a is constructed in the following manner: the handle 5 can be attached to or detached from the position shown in fig. 1 in a manner that can be operated in a state where the handle 5 is gripped (held) with the right hand. The control circuit 10 allows driving of the electric motor M even in the case where the handle 5 mounted at the opposite side is thus gripped.

The control circuit 10 makes it impossible to supply current to the electric motor M even if the power switch 4 is turned on in the case where the user does not grasp the handle 5 or in the case where the grasping force is very weak. In addition, the control circuit 10 makes it impossible to supply current to the electric motor M in the case where the handle 5 is not properly mounted with respect to the apparatus main body 1. Further, when the grip force becomes weak from the state in which the grip 5 is gripped and the current is supplied, the control circuit 10 can transition to the current-saving state by maintaining the state in which the supply of the current to the electric motor M is suppressed. These control modes are explained later.

[ handle ]

As shown in fig. 1 and 2, the handle 5 includes: a connection unit 5A detachably connected to the apparatus main body 1; a pair of pressure-receiving members 5B that are displaced by the grasping force of the user; a permanent magnet Mg; a magnet control mechanism 5C that moves the permanent magnet Mg in association with the displacement of the pressure-receiving member 5B; and a cylindrical frame portion 5D.

The frame portion 5D supports a pair of operation levers 17 (a part of the pressure-receiving member 5B) so as to be displaceable. The frame portion 5D accommodates the permanent magnet Mg and the magnet control mechanism 5C in the internal space.

The outer surfaces of the actuating levers 17 of the pair of pressure receiving members 5B of the handle 5 and the outer surface of the frame body 14 of the frame portion 5D are covered with a rubber grip 7 made of soft rubber. The rubber grip 7 protects the pressure-receiving member 5B and prevents dust from entering the frame 5D. Further, since the rubber grip 7 uniformly covers the entire outer periphery of the frame portion 5D, it is difficult to bind the pressure-receiving member 5B with a string-like object, for example, and it is possible to prevent: the user can use the device as a grip state even in an unclamped state. This can prevent a one-handed operation of grasping only the apparatus body 1.

[ handle: connecting part

As shown in fig. 1, 2, and 5, the connecting portion 5A includes a bolt 11 (an example of a coupling member) made of a magnetic material such as steel and a holding member 12 for accommodating the bolt 11 so that the tip of the bolt 11 is exposed. The bolt 11 and the holding member 12 are disposed on the same axis as the frame axis X, and the holding member 12 is integrally formed with a flange portion 12a orthogonal to the frame axis X.

The handle 5 is constructed as follows: the head 11a of the bolt 11 is fitted into the flange 12a of the holding member 12, and by this fitting, the bolt 11 and the holding member 12 are integrally rotated.

As shown in fig. 1 and 5, the apparatus main body 1 includes a nut 8 as a connection holding portion screwed to a bolt 11. The device main body 1 has a magnetic sensor S formed of a hall element inside in order to monitor a magnetic force (magnetic flux density) acting from the permanent magnet Mg via the bolt 11. The magnetic sensor S is disposed near the nut 8, and a detection signal of the magnetic sensor S is transmitted to the control circuit 10. As the magnetic sensor S, a magneto-resistive element or a semiconductor magneto-resistive element may be used.

The handle 5 is integrally rotated, and is attached to the device body 1 so that the tip of the bolt 11 is screwed to the nut 8 (connection holding portion). As shown in fig. 5, when the handle 5 is attached to the apparatus main body 1, the end of the holding member 12 contacts the outer surface of the apparatus main body 1, and the limit of rotation when the handle 5 is screwed is determined, so that the tip of the bolt 11 reaches the vicinity of the magnetic sensor S. Further, the handle 5 is rotated in the opposite direction to the mounting time, so that the handle 5 can be separated from the apparatus main body 1.

The number of nuts 8 as the connection holding portion may be at least one, and if there are two, the magnetic sensor S may be disposed near each nut.

[ handle: frame part

As shown in fig. 2, 4, and 6, the frame portion 5D includes a pair of resin and semi-cylindrical frame bodies 14. By connecting the pair of frame bodies 14 to each other with a plurality of connecting screws 15, a cylindrical frame portion 5D having a cylindrical outer peripheral surface is manufactured. A coupling body 14a protruding outward from the frame body 14 in a direction orthogonal to the frame axis X (see fig. 1) is integrally formed with the frame body 14 at an end portion of the frame body 14 near the holding member 12.

In a state where the pair of frame bodies 14 are coupled, the coupling body 14a integrally formed with the frame body 14 and the flange portion 12a integrally formed with the holding member 12 are fixed by the fixing screw 16, whereby the connecting portion 5A and the frame portion 5D are integrated.

As shown in fig. 3 and 6, a pair of slits SL (see also fig. 2) through which the operation frame 18 of the pressure-receiving member 5B is inserted are formed in the mating surface of the frame portion 5D. A pair of slits SL are formed at two positions sandwiching the frame axis X. In the frame portion 5D, a space in which the operation lever 17 (a part of the pressure-receiving member 5B) is disposed is formed in a recessed shape (a shape recessed from the outer peripheral surface of the frame body 14 at a position farther from the frame axis X than the slit SL) at an outer position of the slit SL. The space thus recessed is referred to as a recessed region 5S.

By forming the concave region 5S, as shown in fig. 6, a space is created between the outer surface of the frame portion 5D and the inner surface of the rubber grip 7, and the operation of the operation lever 17 by the gripping force is facilitated.

[ handle: pressure-bearing member

As shown in fig. 2 and 5, the pair of pressure members 5B are disposed at two positions sandwiching the frame axis X. The pressure receiving member 5B has: an action lever 17; and a pair of plate-shaped operation frames 18 protruding inward in the radial direction of the handle 5 from both ends of the operation lever 17 in the direction along the frame axis X.

The operation frame 18 is disposed at a position where it is inserted into the through slit SL. The operation frame 18 has a rack-and-pinion portion 18a formed therein.

As shown in fig. 2 to 5, the handle 5 is provided with a guide block 19 and a guide plate 20. The guide block 19 and the guide plate 20 hold the one pressure-receiving member 5B and the other pressure-receiving member 5B in such a manner that the rack and pinion portion 18a of the operation frame 18 of the one pressure-receiving member 5B and the rack and pinion portion 18a of the operation frame 18 of the other pressure-receiving member 5B are in a facing positional relationship inside the handle 5.

The guide block 19 is a block arranged at a position overlapping the operation lever 17 when viewed in a direction along the operation direction of the operation lever 17. As shown in fig. 2, the guide block 19 has a pair of concave portions 19a for accommodating a pinion gear 23 (a part of the magnet control mechanism 5C) engaged with the rack-and-pinion portion 18a, a pair of hole portions 19b through which a pinion shaft 23s and the like rotatably supporting the pinion gear 23 are inserted, and a cutout portion 19C in which the rack-and-pinion portion 18a is arranged at an end edge of the side portion.

The guide plate 20 has a pair of through holes 20a in which the pinion gears 23 are disposed. The guide plate 20 includes a rail portion 20b that slidably supports the coupling rack and pinion 24 shown in fig. 2 and 3 in a direction along the frame axis X. In the present embodiment, the pair of pinion gears 23 is provided, but the pinion gears 23 may be single. In addition, the rack and pinion 24 may be configured not to be coupled.

The pair of operation levers 17, and the plurality of urging members 21 disposed between the operation levers 17 and the guide block 19 urge the recessed region 5S of the handle 5 in a direction away from the frame axis X. Thus, when the user grips the handle 5, the urging member 21 is compressed in response to displacement of the operation levers 17, and when the user releases the grip, the pair of operation levers 17 are returned to the non-grip position by the urging force of the urging member 21. The urging member 21 is made of a block-shaped rubber elastic body or resin.

[ handle: magnet control mechanism

As shown in fig. 2 to 4, the magnet control mechanism 5C includes a pair of pinion gears 23, a first intermediate gear 25, a second intermediate gear 26, and a rotating member 27. The rotating member 27 has a sector gear 27a and a holding portion 27b that supports a permanent magnet Mg. The holding portion 27b has a rotation shaft 27s integrally formed with the holding portion 27b.

In the magnet control mechanism 5C, one of the pair of pinions 23 is a first pinion and the other is a second pinion. In each of the pair of operation frames 18, the gear meshing with the first pinion gear is a first rack-and-pinion portion, and the gear meshing with the second pinion gear is a second rack-and-pinion portion. The linking rack gear 24 is meshed with the pair of pinion gears 23.

As shown in fig. 2 to 4, the pinion gear 23 is rotatably supported by a pinion shaft 23 s. The first intermediate gear 25 is rotatably supported by a first shaft 25 s. The second intermediate gear 26 is rotatably supported by the second shaft 26 s.

The ends (both ends) of the pinion shaft 23s, the first shaft 25s, and the second shaft 26s are supported by the inner surfaces of the respective frame bodies 14 of the pair of frame bodies 14. The rotation shaft 27s is disposed at a position on both sides of the rotation member 27. The rotation shafts 27s are rotatably supported with respect to the inner surfaces of the pair of frame bodies 14.

The pinion shaft 23s, the first shaft 25s, the second shaft 26s, and the pair of rotation shafts 27s may be integrally formed with the pinion gear 23, the first intermediate gear 25, the second intermediate gear 26, and the rotation member 27, respectively.

The magnet control mechanism 5C rotates the permanent magnet Mg integrally with the rotating member 27 as a moving means of the permanent magnet Mg. The control method of the permanent magnet Mg by the magnet control means 5C is not shown in the drawings, but includes linear movement of the permanent magnet Mg, movement along an arcuate path, and rotation in a direction substantially orthogonal to the frame axis X.

The gear unit GU is constituted by a pair of pinion gears 23, a first intermediate gear 25, and a second intermediate gear 26. The gear unit GU converts the linear displacement of the operation lever 17 into a rotational operation, and transmits the rotational operation to the rotating member 27. The plurality of gears constituting the gear unit GU are configured as two-stage gears having a small diameter gear portion and a large diameter gear portion, and speed-increasing transmission is realized in which the rotation angle is increased in the order of the pinion gear 23, the first intermediate gear 25, and the second intermediate gear 26.

In order to achieve this speed-increasing transmission, the rotation of the large-diameter gear portion of the pinion gear 23 is transmitted to the small-diameter gear portion of the first intermediate gear 25, the rotation of the large-diameter gear portion of the first intermediate gear 25 is transmitted to the small-diameter gear portion of the second intermediate gear 26, and the rotation of the large-diameter gear portion of the second intermediate gear 26 is transmitted to the sector gear 27a of the rotating member 27.

In addition, the small diameter gear portions of the pair of pinion gears 23 mesh with the gear portions of the coupling rack gear 24. Thus, even if the user grips the pressure-receiving member 5B of the handle 5 with a bias, the pair of pinion gears 23 can be rotated by the grip force by the same angle, and the displacement of the operation lever 17, which is parallel-moved in parallel with the frame axis X, is transmitted to the gear unit GU.

As shown in fig. 5, the permanent magnet Mg is configured by a bar magnet having magnetic poles (N-pole and S-pole) arranged at both ends. In a state where the handle 5 is not gripped, as shown in fig. 5 (a) and fig. 6, the pair of operation levers 17 are positioned at the non-gripping position separated from the frame axis X to the greatest extent by the urging forces of the plurality of urging members 21.

The gears of the gear unit GU, which are the first intermediate gear 25, the second intermediate gear 26, and the sector gear 27a, are configured as interlocking gears that transmit the rotation operation of the pinion gear 23 to the rotating member 27. The permanent magnet Mg is formed in a block shape having magnetic poles (N-pole and S-pole) arranged at both ends.

Regarding the control circuit 10, the grip 5 is appropriately mounted to the apparatus main body 1, and the magnetic sensor S monitors the magnetic force of the permanent magnet Mg of the grip 5, whereby it is determined that the grip 5 has been appropriately mounted (it is determined that the first condition is not satisfied) based on the direction of the magnetic field and the magnitude of the magnetic force (magnetic flux density). In addition, the control circuit 10 determines that the second condition is not satisfied when the handle 5 is properly attached to the apparatus main body 1 and the handle 5 is not gripped or is not properly gripped. That is, the control circuit 10 determines that the second condition is satisfied when the magnetic sensor S monitors the direction of the magnetic field and the magnitude of the magnetic force (magnetic flux density) when the handle 5 is properly gripped. When the control circuit 10 monitors a preset magnetic force (magnetic force satisfying the first condition and not satisfying the second condition) from a state satisfying the second condition as in the case where the grip force of the handle 5 is lowered, it determines that the third condition is satisfied. Further, the second condition and the third condition are satisfied only in a state where the handle 5 is properly attached to the apparatus main body 1. These control modes are described below.

That is, when the handle 5 is not attached and the pair of pressure-receiving members 5B are not displaced, the magnet control mechanism 5C maintains the magnetic force acting on the magnetic sensor S from the permanent magnet Mg via the magnetic bolt 11 (one example of a coupling member) in a state that does not satisfy the first condition. In contrast, in a state where the handle 5 is properly attached, the magnet control mechanism 5C maintains the magnetic force acting on the magnetic sensor S from the permanent magnet Mg via the magnetic bolt 11 in a state where the pair of pressure-receiving members 5B are not displaced, in a state where the first state is satisfied.

Next, when the user grips the handle 5 and displaces the pair of pressure receiving members 5B by the grip force, the magnet control mechanism 5C rotates the permanent magnet Mg by 90 degrees around the rotation shaft 27 s. Thereby, the magnetic force acting on the magnetic sensor S from the magnetic pole of the permanent magnet Mg via the bolt 11 satisfies the second condition. That is, the magnet control means 5C controls the position of the magnetic pole of the permanent magnet Mg so that the magnetic force acting on the magnetic sensor S from the magnetic pole of the permanent magnet Mg via the bolt 11 satisfies the second condition. In a state where the second condition is satisfied, the user turns on the power switch 4, whereby the control circuit 10 supplies current to the electric motor M.

When the user lowers the grip force of the handle 5 in a state where the electric current is supplied to the electric motor M in this way, the magnet control means 5C controls the position of the magnetic pole of the permanent magnet Mg so that the second condition is not satisfied but the third condition is satisfied. When the control circuit 10 determines that the third condition is satisfied, it maintains the current supplied to the electric motor M. In particular, the maintenance of the supply of the current to the electric motor M is performed only when the transition from the state satisfying the second condition to the state not satisfying the second condition (the state satisfying the third condition) is performed.

When the user further lowers the grip force of the handle 5 based on the state in which the third condition is satisfied, the magnet control means 5C controls the position of the magnetic pole of the permanent magnet Mg so as to be in a state in which the third condition is not satisfied. In this way, when it is determined that the third condition is not satisfied, the control circuit 10 supplies a limited current (saved current) to the electric motor M. In particular, only when the state is changed from the state satisfying the third condition to the state not satisfying the third condition, the maintenance of the supply of the current (the saved current) to the electric motor M is performed.

The control circuit 10 is set so that current cannot be supplied in a state where the first condition is not satisfied. In addition, with respect to the control circuit 10, when the state of the first condition is changed to be satisfied, the current can be supplied, but when only the first condition is determined to be satisfied, even if the power switch 4 is turned on, the supply of the current to the electric motor M is not started. When it is determined that the handle 5 is properly gripped and the power switch 4 is turned on in a state in which the second condition is satisfied (a state in which the first condition is satisfied and the second condition is satisfied), the control circuit 10 supplies current to the electric motor M (starts to supply current). With regard to the control circuit 10, thereafter, in the case where it is determined that the grip strength is lowered and the second condition is not satisfied but the third condition is satisfied, the supply of current to the electric motor M is continued. When the control circuit 10 determines that the state is changed from the state in which the third condition is satisfied to the state in which the gripping force is further reduced and the third condition is not satisfied, the control circuit is changed to a saving mode in which a predetermined current is supplied to the electric motor M.

In the present embodiment, the first condition, the second condition, and the third condition are conditions determined by the magnitude of the magnetic force (magnetic flux density) acting on the magnetic sensor S, or the magnitude of the magnetic force (magnetic flux density) and the direction of the magnetic field. If the direction of the magnetic force acting on the magnetic sensor S is a predetermined direction and the magnitude of the magnetic force (magnetic flux density) is equal to or greater than a predetermined magnitude, the magnetic force satisfies the first condition. In this case, the magnetic pole acting on the magnetic sensor S may be either an N pole or an S pole, or the N pole and the S pole may be arranged in accordance with the characteristics of the magnetic sensor S.

Further, the setting to transition to the saving mode in a state where the third condition is not satisfied may be a setting to stop the supply of the current to the electric motor M, and the setting to transition to the saving mode in a state where the third condition is not satisfied may be a setting to stop the supply of the current to the electric motor M in a state where the third condition is not satisfied and the first condition is satisfied.

Depending on at least one of the size of the handle 5, the distance between the pressure-receiving member 5B and the bolt 11, and the size and shape of the permanent magnet Mg, one or both of the first intermediate gear 25 and the second intermediate gear 26 can be omitted. Alternatively, an intermediate gear can be added.

[ mode of action ]

As shown in fig. 5 (a), when the magnet control mechanism 5C is located at the non-gripping position where the handle 5 is not gripped, the rotation pattern of the rotating member 27 is set so that the direction in which the magnetic poles (N-pole and S-pole) of the permanent magnets Mg are aligned is maintained in the direction orthogonal to the frame axis X.

By setting the form of the permanent magnet Mg in this way, the structure is as follows: each of the pair of magnetic poles of the permanent magnet Mg is separated to the greatest extent from the head 11a of the bolt 11, and the magnitude of the magnetic force (magnetic flux density) acting on the magnetic sensor S from the permanent magnet Mg via the bolt 11 is the smallest in the present embodiment. That is, the magnetic force acting on the magnetic sensor S is maintained in a state where the first condition is not satisfied.

The control circuit 10 (see fig. 1) of the apparatus main body 1 may store a threshold value of the output voltage so that the presence or absence of gripping can be determined based on the output voltage output from the hall element constituting the magnetic sensor S. The output voltage varies according to the magnitude of the magnetic force (magnetic flux density) applied by the permanent magnet Mg. Therefore, as the threshold value, a value corresponding to the magnitude of the magnetic force (magnetic flux density) that varies depending on the presence or absence of gripping, or the direction of the magnetic field and the magnitude of the magnetic force (magnetic flux density) is set.

As a result, as shown in fig. 5 (a), when the pressure-receiving member 5B is positioned at the non-gripping position, the control circuit 10 determines that the vehicle is not gripped based on the output voltage of the magnetic sensor S, and cannot supply current to the electric motor M.

On the other hand, as shown in fig. 5B, when the holding position where the pressure-receiving member 5B is held is reached, the magnet control mechanism 5C converts the linear motion of the motion lever 17 into the rotational motion by the gear unit GU, and the magnetic poles (N pole and S pole) of the permanent magnet Mg are aligned along the frame axis X (parallel state). Specifically, the magnet control mechanism 5C controls as follows: the rotation form of the rotation member 27 is rotated 90 degrees around the rotation shaft 27S so that the direction in which the magnetic poles (N pole and S pole) of the permanent magnet Mg are aligned is along the frame axis X. Thereby, the direction of the magnetic field acting on the magnetic sensor S and the magnitude of the magnetic force (magnetic flux density) reach a state satisfying the second condition via a state satisfying the first condition.

By controlling the form of the permanent magnet Mg in this way, one of the pair of magnetic poles of the permanent magnet Mg is opposed to the head 11a of the bolt 11, and the magnitude of the magnetic force (magnetic flux density) acting from the permanent magnet Mg to the magnetic sensor S through the bolt 11 is increased.

As a result, as shown in fig. 5 (B), when the handle 5 is operated to the grip position, the control circuit 10 determines that the handle 5 is gripped based on the output voltage of the magnetic sensor S, and can supply current to the electric motor M. That is, the second state is satisfied, and the supply of the current for driving the electric motor M is started by the on operation of the power switch 4.

In the disk grinder a, the disk grinder a is configured as follows: when the grip force becomes weak from the state in which the current is supplied by gripping the handle 5, even if the magnetic force acting on the magnetic sensor S does not satisfy the second condition, the state transitions to the saving mode (saving state) when the third condition is satisfied.

In this disk grinder a, if the state of satisfying the second condition or the third condition is changed to the state of not satisfying the first condition due to the release of the grip of the handle 5 or the release of the hand from the handle 5, the control circuit 10 can be set so as to stop the supply of the electric current to the electric motor M based on the output voltage of the magnetic sensor S.

In this saving mode, it is possible to supply current to devices other than the electric motor M, but the consumption of current is suppressed by suppressing the current supplied to the electric motor M. In the saving mode, for example, a lamp showing that the handle 5 is in the saving mode can be turned on or a notification that the grip of the handle 5 is insufficient can be recognized. The present invention may be configured as follows: in the saving mode, the rotation speed of the disc 2 is reduced by reducing the current supplied to the electric motor M, so that the insufficient gripping force of the handle 5 is recognized.

[ modification of magnet control mechanism ]

The magnet control mechanism 5C described above rotates the permanent magnet Mg by 90 degrees around the rotation axis 27s, but it is also conceivable to rotate the permanent magnet Mg by 180 degrees.

In this case, the control circuit 10 can be configured to monitor that the grip 5 is gripped by using a magnetic sensor capable of discriminating a magnetic pole as the magnetic sensor S. Specifically, the present invention can be configured as follows: when the handle 5 is not gripped and the actuating lever 17 is not displaced, for example, the N pole of the permanent magnet Mg is brought close to the head 11a of the bolt 11, and when the handle 5 is gripped and the actuating lever 17 is displaced, the permanent magnet Mg is rotated 180 degrees to bring the S pole close to the head 11a of the bolt 11, so that the control circuit 10 can monitor that the handle 5 is gripped. At this time, if the direction of the magnetic field from the bolt 11 toward the S pole of the permanent magnet Mg is a predetermined direction, the magnitude of the magnetic force (magnetic flux density) generated by the S pole of the permanent magnet Mg acting on the magnetic sensor S is equal to or greater than a predetermined magnitude, and the second condition is satisfied.

The angle by which the magnet control means 5C rotates the permanent magnet Mg about the rotation axis 27s is not limited to 90 ° or 180 °, and may be less than 90 ° or more.

[ Effect of the embodiment ]

The disc grinder a configured as described above cannot operate the electric motor M when the handle 5 is not properly attached or when the user does not grasp the handle properly, and the electric motor M is operated to realize the work by satisfying the condition that the handle 5 is properly attached and the user grasps the handle 5 properly.

As one configuration for properly determining that the handle 5 is properly gripped in this way, the magnet control mechanism 5C expands the minute operation of the operation lever 17 when the user grips the handle 5, and rotates the permanent magnet Mg by 90 degrees. Therefore, when the user grips the handle 5, it is not necessary to displace the operation lever 17 by a large stroke. As a result, the outer diameter of the handle 5 is not increased.

In the handle 5, in order to couple the handle 5 to the apparatus main body 1, a magnetic material such as iron and steel is used as the connection portion 5A for the bolt 11, and at least a part of the bolt 11 constituting the connection portion 5A is used to apply the magnetic force of the permanent magnet Mg to the magnetic sensor S, so that a configuration can be made in which a dedicated yoke or the like separate from the bolt 11 is not used.

The following constitution is also adopted: by rotating the permanent magnet Mg in the vicinity of the head 11a at the inner end of the bolt 11, the magnetic force (magnetic flux) of the permanent magnet Mg acts on the magnetic sensor S via the bolt 11. Therefore, for example, the arrangement of the permanent magnets Mg is reasonable and the design of the handgrip 5 is easy, compared with a configuration in which the magnetic flux of the permanent magnets Mg directly acts on the magnetic sensor S.

The magnet control mechanism 5C is configured to couple the pair of pinion gears 23 by coupling the rack gears 24, so that the operation (linear displacement) of the operation lever 17 is converted into rotation (rotational operation). Thus, the following can be achieved: even if the pressure-receiving member 5B is gripped with a bias, the displacement that moves the operation lever 17 of the pressure-receiving member 5B in parallel while maintaining the state parallel to the frame axis X is transmitted to the gear unit GU. Thereby, the control circuit 10 can determine whether the user is gripping or not gripping based on the output voltage output from the magnetic sensor S. Further, the magnetic sensor S outputs an output voltage of a value corresponding to a magnetic force that varies depending on (for example, grip release, etc.).

Since the transition to the saving mode is possible, it is also possible to recognize that the grip of the handle 5 is insufficient in the saving mode.

The magnet control mechanism 5C is accommodated in the frame portion 5D and mechanically operates in response to the grasping. Therefore, it is not necessary to provide electrical contacts, electrical wiring, and the like in the connection portion 5A, and the routing work of the electrical wiring in the manufacturing process is not necessary. In addition, the contact failure caused by corrosion, abrasion, deformation and the like of the electric contact or the grip failure caused by disconnection of the electric wiring does not occur. The following structure is provided: the permanent magnet Mg and the magnet control mechanism 5C are accommodated in the frame portion 5D, and the pressure-receiving member 5B is disposed at the non-gripping position and the magnetic pole of the permanent magnet Mg is disposed at a position separated from the bolt 11, whereby the screw joint portion 8a of the nut 8 which is screw-engaged with the holding member 12 of the bolt 11 is hardly acted on by the magnetic force generated by the permanent magnet Mg. Accordingly, when the user does not grasp the handle 5, the magnetic force does not act on the screw joint portion 8a, so that a magnetic substance such as iron powder is less likely to be attracted to the nut 8 (in the vicinity of the screw joint portion 8 a), and the mounting failure caused by the foreign matter caught by the magnetic substance can be reduced.

[ other embodiments ]

The present disclosure may be configured as follows (the portions having the same functions as those of the embodiments are given the same numbers and symbols as those of the embodiments) in addition to the embodiments described above.

(a) The structure is as follows: even when the operation lever 17 is not gripped, the handle 5 can be determined to be properly attached to the apparatus main body 1 based on the magnitude of the magnetic force (magnetic flux density) acting on the magnetic sensor S from the permanent magnet Mg via the bolt 11 when the handle 5 is attached to the apparatus main body 1.

That is, in a state where the operation lever 17 is not gripped, the magnetic force (magnetic flux density) acting from the permanent magnet Mg on the magnetic sensor S is not large (smaller than the magnitudes of the magnetic forces (magnetic flux densities) corresponding to the first condition and the second condition described above), but the magnitudes of some of the magnetic forces (magnetic flux densities) can be monitored with the magnetic sensor S via the bolt 11, so that, for example, a condition for determining the magnitudes of the magnetic forces (magnetic flux densities) when the handle 5 is attached is set.

In the case where the electric drive apparatus is configured as in the other embodiment (a), it is set that: conditions corresponding to the direction of the magnetic field and the magnitude of the magnetic force (magnetic flux density) monitored by the magnetic sensor S when the handle 5 is mounted to the apparatus main body 1; and conditions corresponding to the direction of the magnetic field and the magnitude of the magnetic force (magnetic flux density) monitored by the magnetic sensor S when the handle 5 is gripped in a state where the handle 5 is attached to the apparatus main body 1. The setting of the controllable electric drive device can be performed depending on the state in which the condition is satisfied and the state in which the condition is not satisfied. The number of conditions corresponding to the direction of the magnetic field and the magnitude of the magnetic force (magnetic flux density) can be set to 2 (first condition and second condition), but the first condition and the second condition may be the same, or 3 or more conditions may be set.

Therefore, it is also possible to determine a state in which the handle 5 is not attached to the apparatus main body 1 or a state in which the attachment is insufficient, for example, by turning on a lamp, the user can recognize that the handle 5 is not attached properly.

When the user sets the handle 5 to the non-gripping state, in order to determine whether the state of attachment of the handle 5 is appropriate, either the N pole or the S pole selected according to the polarity of the magnetic sensor S may be inclined in the direction approaching the magnetic sensor S in the non-gripping state, or either the N pole or the S pole selected according to the polarity of the magnetic sensor S may be opposed to the magnetic sensor S or may be inclined in the appropriate gripping state.

(b) As the handle 5 (attachment member), a magnetic rod-shaped body having a claw body (coupling member) for engagement at the tip thereof is used. In this configuration, a bayonet-type coupling-capable configuration is used in which the handle 5 is rotated about the frame axis X and engaged with a plurality of claws (coupling members) of the device body 1. In addition, as a different configuration, a magnetic rod-shaped body having a recess (coupling member) for engagement at the tip is used as the handle 5 (attachment member). In this different configuration, a configuration may be considered in which the locking member (connecting member) is engaged with the recess of the tip of the rod-like material to thereby produce a state of preventing the rod-like material from falling off, and the locking member (connecting member) may be configured to be capable of being coupled by another connecting mechanism.

As described above, the coupling member for attaching the handle 5 (accessory member) to the apparatus main body 1 is not limited to the bolt 11, and the connecting member for coupling the coupling member to the apparatus main body 1 is not limited to the nut 8, and any configuration can be used. The number of the coupling members and the connecting members is not limited to 1, and may be plural.

(c) In order to increase the magnitude of the magnetic force (magnetic flux density) applied to the magnetic sensor S, for example, a magnetic body such as an iron piece (which can also be grasped as a yoke) is disposed on the back surface of the magnetic sensor S (the surface on the opposite side of the bolt 11) or in the vicinity of the magnetic sensor S. In addition, for example, in a state where the handgrip 5 is not attached to the apparatus main body 1, a magnetic shield is provided in the vicinity of the magnetic sensor S or the like in order to eliminate an improper situation where a magnetic force outside the apparatus main body 1 acts on the magnetic sensor S and is erroneously detected.

(d) The disc grinder a (electric drive device) is constituted as follows: only when the handle 5 is twisted around the frame axis X simultaneously with the operation of gripping the handle 5, the electric motor M can be driven by the on operation of the power switch 4.

As the configuration of this other embodiment (d), in addition to the configuration of monitoring the grip of the pressure-receiving member 5B as described in the embodiment, a switch or the like for monitoring the twisting operation of the handle 5 is required, but since the electric motor M can be driven based on the grip operation and the twisting operation, an improper situation of erroneously driving the electric motor M can be eliminated.

(e) The magnet control mechanism 5C is configured as follows: by transmitting the displacement of the operation lever 17 to the rotating member 27 via a rod or wire without using a gear, the rotating member 27 is rotated about the rotation shaft 27 s. In this case, at least one of the pair of operation levers 17 may be displaced.

In this other embodiment (e), for example, the magnet control mechanism 5C may be configured as follows: the pair of operation levers 17 are linked by a pantograph link, and when the pair of operation levers 17 are displaced by a gripping force, the displacement of the pantograph link is transmitted to the rotary member 27 via a rod or a wire. In this case, at least one of the pair of operation levers 17 may be displaced.

(f) The magnet control mechanism 5C is configured as follows: the displacement of the operation lever 17 is converted into a fluid pressure without using a gear, and the pressure is transmitted to the rotating member 27, whereby the rotating member 27 is rotated about the rotation shaft 27 s. In this case, at least one of the pair of operation levers 17 may be displaced.

In this other embodiment (f), for example, the following cylinders and the like may be used: the rotary member 27 according to the embodiment is rotated by sealing a fluid such as oil into a chamber or a bellows whose volume changes due to displacement of the operation lever 17 and transmitting the pressure of the oil.

(g) The magnet control mechanism 5C is configured as follows: an elastic member having reversibility, which is deformed by the pressure from the operation lever 17 and returns to its original shape by releasing the pressure, is disposed in a region from the vicinity of the operation lever 17 to the vicinity of the rotating member 27 in the embodiment, whereby the pressure generated by the deformation of the elastic member is directly transmitted from the elastic member to the rotating member 27, and the rotating member 27 is rotated to release the pressure, thereby returning the rotating member 27 to its original shape.

As a modification of this other embodiment (g), it is conceivable that the magnet control mechanism 5C is constituted only by an elastic member without using a mechanically operated mechanism such as a gear. In this modification, for example, the permanent magnet Mg may be brought close to the head 11a of the bolt 11 by applying pressure, and the permanent magnet Mg may be separated from the head 11a of the bolt 11 when the pressure is reduced, and the following configuration may be considered: in accordance with the pressing force and the release force applied to the elastic member, a mechanical structure is partially used in which the permanent magnet Mg is rotated in the same manner as in the embodiment.

(h) The magnet control mechanism 5C is configured as follows: the permanent magnet Mg is switched to a position close to and separated from the inner end of the bolt 11 in the direction along the frame axis X.

In other embodiments (a) to (h), as a configuration for switching the positions of the magnetic poles of the permanent magnet Mg without rotating the permanent magnet Mg, a configuration in which the permanent magnet Mg is moved, for example, linearly or along an arcuate path may be considered.

(i) The biasing member 21 is not limited to a rubber elastic body, but a compression spring or a leaf spring is used. By using a spring or the like in this way, the operation lever 17 is reliably moved to the non-gripping position.

(j) The electric drive device is configured as follows: the electric motor M is provided with a secondary battery inside without using the power supply line 6, and is driven by electric power supplied from the secondary battery.

(k) The operation lever 17 is configured to be provided only one instead of a pair. Alternatively, the structure is provided with three or more.

The constitution is as follows: the pinion gear 23 may be one, and the operating frame 18 of the pressure-receiving member 5B may be one, and the rack-and-pinion portion 18a may be one.

(l) The electric drive device is not limited to the disk grinder a, but is used for a hand-held drill as a tool for piercing, an electric tool such as an electric screwdriver for tightening a bolt, or the like.

Claims

1. An electric drive device, comprising:

A device body; and

an attachment member attachable to and detachable from the apparatus main body,

the accessory part has: a connection portion connected to the device body; a pressure-receiving member that is displaced inward by a gripping force when a user grips the accessory member; a permanent magnet; a magnet control mechanism for moving or changing the orientation of the permanent magnet in association with the displacement of the pressure-receiving member; and a frame portion that displaceably supports the pressure-receiving member and accommodates the magnet control mechanism,

the device body has a magnetic sensor that detects a magnetic force of the permanent magnet acting through at least a part of the connection portion when the pressure-receiving member is displaced in a state where the accessory member is attached to the device body.

2. The electric drive apparatus according to claim 1, wherein,

the device body has a connection holding portion capable of coupling the accessory component to the device body by coupling a coupling component.

3. The electric drive apparatus according to claim 1, wherein,

the connecting part is provided with a magnetic coupling component,

the device body has a connection holding portion capable of performing connection of the accessory component to the device body by a tip end to which the connection component is connected,

The permanent magnet causes the magnetic force to act on the magnetic sensor via the coupling member.

4. An electric drive according to claim 3, wherein,

the magnet control means controls the position of the magnetic pole of the permanent magnet so that the magnetic force acting from the permanent magnet to the magnetic sensor via the coupling member is maintained in a state that the first condition is not satisfied when the pressure-receiving member is not displaced in the non-gripping position, and the magnetic force acting from the permanent magnet to the magnetic sensor via the coupling member is maintained in a state that the second condition is satisfied when the pressure-receiving member is displaced by the gripping force.

5. The electric drive apparatus according to claim 4, wherein,

when the first condition is not satisfied, the pressure-receiving member is displaced so as to transition to a state satisfying the first condition, and the electric current in the electric drive device is supplied,

in a state where the first condition is satisfied and the second condition is satisfied, the supply of current to the electric drive apparatus can be started, and even if the current supply is transited to a state where the first condition is satisfied and the second condition is not satisfied, the supply of current can be continued.

6. The electric drive apparatus according to claim 4 or 5, wherein,

the magnet control mechanism controls the position or orientation of the magnetic pole of the permanent magnet to a state in which the magnetic force acting on the magnetic sensor from the permanent magnet via the coupling member satisfies the first condition and does not satisfy the third condition when the pressure-receiving member is displaced by the grasping force, and can save current when the first condition is satisfied and the third condition is not satisfied.

7. The electric drive apparatus according to any one of claims 4 to 6, wherein,

the magnet control mechanism is composed of the following components: a rotating member rotatably supporting the permanent magnet; and a gear unit that converts a displacement motion when the pressure-receiving member is displaced by the gripping force into a rotation motion and transmits the rotation motion to the rotating member,

when the pressure-receiving member is displaced, the magnetic pole of the permanent magnet approaches the coupling member to rotate the rotating member, and the magnetic force acting on the magnetic sensor acts.

8. The electric drive apparatus according to claim 7, wherein,

The electric drive device is configured as follows: by disposing the pressure-receiving members at two positions along the longitudinal direction of the frame portion, at least 1 of the pressure-receiving members are displaced in a direction in which the pair of pressure-receiving members approach each other when the user grips the accessory member,

the gear unit is provided with: a pinion gear engaged with rack and pinion portions formed in a pair of operation frames integrally moved with each of the pair of pressure members; and a plurality of linked gears that transmit the rotation motion of the pinion gear to the rotating member.

9. The electric drive apparatus according to claim 8, wherein,

the pinion gear is composed of a first pinion gear and a second pinion gear,

the first pinion gear is provided so as to mesh with a first rack gear portion of a first operation frame formed on one operation frame side of a pair of operation frames integrally moving with each of the pair of pressure members,

the second pinion gear is provided so as to mesh with a second rack-and-pinion portion formed on the other of the pair of operation frames,

The first pinion and the second pinion are linked to each other by a linking rack gear.

10. The electric drive according to any one of claims 1 to 9, wherein,

and a biasing member provided in the frame portion, the biasing member being configured to act in such a manner that the biasing member is pushed out in a direction away from the frame axis extending in the longitudinal direction of the frame portion when the pressure member is displaced inward.

11. The electric drive apparatus according to claim 10, wherein,

as the urging member, at least 1 of a rubber elastic body, a coil spring, and a leaf spring is used.